40 Piece SAE Carbon Tap And Die SetContains: 1" O. D. round dies: 4 40, 6 32, 8 32, 10 24, 10 32, 12 24, 1 4" 20, 1 4" 28, 5 16" 18, 5 16" 24, 3 8" 16, 3 8" 24, 7 16" 14, 7 16" 20, 1 2" 13, 1 2" 20, 1 8" 27 NPT, 1 Die Stock, Screw Pitch Gauge, 2 Tap Wrenches and Screwdriver. Ideal for creating new tools from raw steel or repairing damaged and worn threads on existing nuts and bolts Designed to cut and renew internal and external threads to exacting standards for a precision fit every